CAT5115 datasheet(2/14 Pages) ONSEMI

2 / 14 page

CAT5115

Doc. No. MD-2117 Rev. J

Characteristics subject to change without notice

PIN CONFIGURATION

PDIP 8-Lead (L), SOIC 8-Lead (V),

MSOP 8-Lead (Z)

INC

¯¯¯ 1

8 VCC

U/D

7 CS

¯¯

RH 3

6 RL

GND 4

5 RWB

CAT

TSSOP 8-Lead (Y)

¯¯

8 RL

VCC 2

7 RWB

INC

¯¯¯ 3

6 GND

U/D

5 RH

CAT

TDFN 8-Pad

(ZD7) Top View

INC

¯¯¯ 1

8 VCC

U/D

¯ 2

7 CS

¯¯

RH 3

6 RL

GND 4

5 RWB

PIN DESCRIPTIONS

Name Function

INC

¯¯¯

Increment Control

U/D

Up/Down Control

Potentiometer High Terminal

GND

Ground

Buffered Wiper Terminal

Potentiometer Low Terminal

¯¯

Chip Select

VCC

Supply Voltage

PIN FUNCTION

INC

¯¯¯: Increment Control Input

The INC

¯¯¯ input moves the wiper in the up or down

direction determined by the condition of the U/D

¯ input.

U/D

¯: Up/Down Control Input

The U/D

¯ input controls the direction of the wiper

movement. When in a high state and CS

¯¯ is low, any

high-to-low transition on INC

¯¯¯ will cause the wiper to

move one increment toward the RH terminal. When in

a low state and CS

¯¯ is low, any high-to-low transition

on INC

¯¯¯ will cause the wiper to move one increment

towards the RL terminal.

RH: High End Potentiometer Terminal

RH is the high end terminal of the potentiometer. It is

not required that this terminal be connected to a

potential greater than the RL terminal. Voltage applied

to the RH terminal cannot exceed the supply voltage,

VCC or go below ground, GND.

RW: Wiper Potentiometer Terminal

RW is the wiper terminal of the potentiometer. Its

position on the resistor array is controlled by the

control inputs, INC

¯¯¯, U/D

¯ and CS

¯¯ . Voltage applied to

the RW terminal cannot exceed the supply voltage,

VCC or go below ground, GND.

RL: Low End Potentiometer Terminal

RL is the low end terminal of the potentiometer. It is

not required that this terminal be connected to a

potential less than the RH terminal. Voltage applied to

the RL terminal cannot exceed the supply voltage, VCC

or go below ground, GND. RL and RH are electrically

interchangeable.

¯¯ : Chip Select

The chip select input is used to activate the control

input of the CAT5115 and is active low. When in a

high state, activity on the INC

¯¯¯ and U/D

¯ inputs will not

affect or change the position of the wiper.

DEVICE OPERATION

The CAT5115 operates like a digitally controlled

potentiometer with RH and RL equivalent to the high

and low terminals and RW equivalent to the

mechanical potentiometer's wiper. There are 32

available tap positions including the resistor end

points, RH and RL. There are 31 resistor elements

connected in series between the RH and RL terminals.

The wiper terminal is connected to one of the 32 taps

and controlled by three inputs, INC

¯¯¯, U/D

¯ and CS

¯¯ .

These inputs control a five-bit up/down counter whose

output is decoded to select the wiper position.

With CS

¯¯ set LOW the CAT5115 is selected and will

respond to the U/D

¯ and INC

¯¯¯ inputs. HIGH to LOW

transitions on INC

¯¯¯ will increment or decrement the

wiper (depending on the state of the U/D

¯ input and

five-bit counter). The wiper, when at either fixed

terminal, acts like its mechanical equivalent and does

not move beyond the last position. When the

CAT5115 is powered-down, the wiper position is

reset. When power is restored, the counter is set to

the mid point, tap 15.

CAT5115 Datasheet(PDF) 2 Page - ON Semiconductor

CAT5115 Datasheet(HTML) 2 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Datasheet Download

Link URL